The following data represents the quarterly statements of sales taxes (in thousands of dollars), corresponding to the period that ended in March 2021, sent to the comptroller by the 50 businesses established in a locality. 10.3 11.1 9.6 9.0 14.5 13.0 6.7 11.0 8.4 10.3 13.0 11.2 7.3 5.3 12.5 8.0 11.8 8.7 10.6 9.5 11.1 10.2 11.1 9.9 9.8 11.6 15.1 12.5 6.5 7.5 10.0 12.9 9.2 10.0 12.8 12.5 9.3 10.4 12.7 10.5 9.3 11.5 10.7 11.6 7.8 10.5 7.6 10.1 8.9 8.6 to. Find the mean, variance, and standard deviation of this population. (15 pts) b. What proportion or percentage of these businesses have tax returns quarterly sales tax within 1, 2 or 3 standard deviations from the mean? (10 pts) c. Compare and find the differences between your findings with what should be wait according to the Empirical Rule. Are you surprised by the results obtained in b? (5 pts)